Toshiba CF19G32

SuntharAbout 3 min

Toshiba CF19G32 CRT RGB mod

Captured from RGB modded NES

CRT safety

Caution

You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.

READ THIS BEFORE CONTINUING

Plan of attack

READ THIS TO PREPARE

Theory

Sometimes it is nice to know the theory behind the mod. I have put this on a separate page. This shows how the various resistor values are calculated.

READ THE RGB MODDING THEORY

Specs

Toshiba CF19G32

Manufactured: Made in Thailand, May 2001
NTSC, 60 Hz
Chassis: CF19G32
Tube: Toshiba A48KZL70X
OSD Chip: TMP87CM34BN
Jungle Chip: TA1223AN

Service manuals

CF19G32 Service Manual

Schematics

Get hold of the schematics for your TV. Understand where the RGB and Fast Blanking signals go from OSD to the Jungle (Chroma) chip.

Jungle Chip ^

OSD Chip ^

Mux Diagram ^

Performing the mod

STEP 1: Remove the following components

Remove the three 1.2 kΩ, RGB resistors to ground

RR90
RR91
RR92

STEP 2: Remove jumpers and install diodes

Remove jumpers 035, 036 and 037. Install diodes (1N4148) in those locations instead. Pay attention to the direction of the diodes. This will prevent the current from going into the OSD, creating a reflection in signal, that causes interference.

STEP 3: Connect RGBs

Points where the R, G, B and Blank (brown) wires should be connected. Ignore the colors of the wires. I used a shielded wire for this mod. R, G, B wires were not individually shielded. However, there were absolutely no intereference noticed.

STEP 4: Hook up blanking and Audio

Routed the wires from the top of the board to the bottom side. Some holes were covered with solder. Removed it to expose the holes and routed the wires through them.

Purple and black wires were routed to ground. Yellow wire to composite input pin. White wire to audio left. Gray wire to audio right.

STEP 5: Build your mux circuit

Below mod uses the RGB mux board. This is optional, but will make your mod easier and stable. You can also create the circuit presented in the schematics above without the board. Please also checkout the precalculated resistor values.

I had to use a RGB tuner gadget I made to find the right balance for RGB termination. It was found using a 150Ω to 180Ω resistor gave the best vibrancy of colors.

Buy your RGB mux board

TV Model	CF19G32	RGB Mux Board Notes
RGB inline resistors (on crt chassis)	4.7kΩ	RA22, RA23, RA24
Ground resistors (on crt chassis)	1.2kΩ	RR90, RR91, RR92 (removed from chassis)

RGB termination	180Ω	R1, R2, R3 (measured using the tuner)
RGB inline resistors	1kΩ	R4, R5, R6 (measured using the tuner)
Audio LR	1kΩ	R7, R8 (1 kΩ resistor present on the board)
Blanking diode	1N4148	R9
Blanking ground	open	R10 (CRT internal grounding resistor is used)
Diode	6.8kΩ	R11